Memory problem using visa serial functions in my vi

The last few days i created an application that reads data from one of
serial ports (contactless card reader). Today i noticed that my
application had crashed and Windows had displayed a message that my
system was low on virtual memory. I reset the system and i re-run the
application, having the task manager opened. I noticed that the memory
usage of my exe was taking more and more memory (starting from
21.520KB) as the seconds went by. In 5 minutes my app was using
25Mbytes! What i do in my application exactly, is opening the serial
port then i enter the main while-loop, then every 2 seconds i read
from the serial and write them to a tag.
I have used standard visa serial functions of Labview. When I trace my
application and simultaneously run TASKManager of windows to see the
memory, I saw that after running every Visa function memory usage goes
up!!!
what must I do? Please help me to overcome this problem.
Thanks,
M.Naghipourfar

Trust me, people use serial communication with LV all the time without losing memory. I can't check the example at the moment, but If it had a problem someone would have caught on to it by now. In any case, even if using the serial VIs causes the memory usage to go up, it shouldn't be dramatic, definitely not enough to crash the application and consume all memory.
Like I said, post your code (there is an attachment field when you write your message and you can save all your files into a single file by opening the main VI and selecting File>>Save with Options>>Development Distribution) and we will probably be able to find your problem.
To learn more about LabVIEW, I suggest you try searching this site and google for LabVIEW tutorials. Here and here are a couple you can start with. You can also contact your local NI office and join one of their courses.
In addition, I suggest you read the LabVIEW style guide and the LabVIEW user manual (Help>>Search the LabVIEW Bookshelf).
Try to take over the world!

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Static VI with Visa serial functions is very slow to display front panel

THere is a delay time of about 10-20 seconds to "display" the first VI's front panel that has Visa serial functions in the source code.
All works fine after the first load but the initial delay of the front panel load makes it look like the PC could hang during this time. AFter this other VI's load immediately with no delay. I am concerned because I do not want to have to load a VI manually every time I start the APP which is the only workaround I can do at this time.
Im wondering if anyone else has seen this kind of behaviour.
I do not remember this happening until I upgraded my APP to LV7.
DEll optiplex GX260 with 500MB RAM, Win2k and using N.I PCI-232-16 card w/ LV7 now.
Attachments:
RECV_LOOP.vi ‏55 KB

I would like to resurrect this thread, as I am having the same problem. The problem stems from the VISA resource control on my front panel, because I have many COM ports registered on my system. The last suggestion from Scott B. was to "post the resulting .SPY file and I'll take a look at it". So, here is my .SPY file, and as you can see, it takes far too long. As many of these COM ports were registerd from USB converters, most of them are not actually present at this time on the system. However, even the ports that ARE present take a long time to register (i.e. COM1 is present and shows 3 seconds to register). These COM ports shown in my VISA resource do not correspond to those shown in my Device Manager, nor do they correspond to those shown in MAX under Devices and Interfaces.
I am using LV 7.0 on WinXP SP2, with VISA version 3.2.
OK, I just discovered something that mostly cured the delay. When I was getting the VISA version number just now, from MAX in the Software>NI-VISA item, there is a tab "VISA Options", and another tree structure in the middle pane. Selecting "General Settings>Aliases", there was a list of the old COM ports, so I cleared this list and then re-started MAX, checked again, and now only the COM ports shown in "Devices and Interfaces" matched this list (which still doesn't match my Device Manager, but no matter). When I re-opened the LabVIEW FP, it opened quickly, and the ports listed in the VISA resource matched those I saw in MAX.
At any rate, although I just cured the symptom, the original problem of old aliases in VISA causing unacceptable delay should be fixed by NI.
David Moerman
TruView Technology Integration Ltd.
P.S. the message poster didn't allow my to post a *.spy extension, so here is the *.zip of it.
Attachments:
Capture.zip ‏2 KB

Is it possible to interface digital i/o modules using VISA serial?

Hi,
Iam using analog and digital modules from trycom for my project.I interface analog modules by modifying the sample code basic serial read and write given in LabVIEW examples.But i found difficulties in interfacing with the digital i/o modules.Is there any sample code forDigital I/O?Is it possible to interface the digital I/O using VISA serial?
Please Mark the solution as accepted if your problem is solved and donate kudoes

Also i found from the net that digital i/o modules can be communicate with Hyperterminal..Is it possible?
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Hello,
I have some trouble with MathScript when i want to use some MATLAB functions in it such as unique or histc. (i'm using windows 7 and LV2010 SP1)
These functions are theoretically supported by MathScript insofar as they exist in MathScript Documentation but they return an error. This error explains that my matrix sizes are invalid but when we are doing exactly the same process with the same matrix in MATLAB, it ends well.
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In order to show you a concrete example :
If we have a X matrix equals to (77 77; 88 96) and we are doing unique(X). The result is supposed to be (77 88 96) but mathscript returns an error.
On the other hand, if X is not a matrix but a vector, unique ends well but i'm not interested in using some vectors (because it is exactly the same kind of problem with some others functions using only matrix).
I could use a matlab node script but in this project, we would to avoid the use of a Matlab Licence.
Do you have some idea in order to fix this kind of problem
Thanks a lot

Hi,
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unique(X(:))
instead.

Out of memory problem using the API

Hi all,
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import oracle.ifs.fdk.ManagersFactory;
import oracle.ifs.fdk.NamedValue;
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t.printStackTrace();
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re-Post

Memory Leak, Deallocating memory after using imaqImageToArray() function

I have created a program (LW/CVI- Imaq Vision), which uses a timer callback to acquire an image, convert the image to an array using the imaqImageToArray() function, manipulates the data in the array, converts the data to an image, displays the image, and disposes of the image(imaqDispose()), and apparently the imaqImageToArray() function clears the allocation pointer, however does not deallocate the memory, such that the next time the function is called again, imaq allocates new memory, thus eventually the application slows down and freezes due to lack of memory. Does anyone have any suggestions?

Hello,
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Best regards,
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Applications Engineering
National Instruments

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Header1
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....Lineitem1
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Header2
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I am able to find the SUM ...but in the target structure's Header field I am getting
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Header1
LFIMG-- 100
LFIMG    100
Header2
LFIMG-- 102
LFIMG    102
How to get a single value for each .
Regards,
Deepak

Solved Myself ...
Placed sum after if without else ...
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Some problem using in this function!!!

Is it valid to write a function like this??
CREATE OR REPLACE FUNCTION
dept_dtls(DEPT_ID IN VARCHAR2)
RETURN record is
DEPT EMPLOYEE.DEPT_ID%TYPE;
STATUS RECORD;
BEGIN
Select COUNT(DESIGNATION),
into STATUS
from EMPLOYEE
where DEPT=DEPT_ID
GROUP BY DESIGNATION;
RETURN STATUS;
END dept_dtls;

There are many things that I don't understand here or probably Oracle even can't understand.
RETURN record
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Problems with parity and flow control using visa serial

I am trying to create a basic user interface with the options that my
company uses most often for a force indicator. You can configure
the indicator over serial, as well as read the values off the
indicator. I am trying to create the user interface so that using
producer/consumer loops with events, once you change a value, it will
write that new value to the serial port, ie the device.
The problem I am having is transfering the parity and flow control
values for the serial config to the Basic read write VI. The
problem is that once the consumer loop executes, it will write the
values correctly to the VI, but then the outer loop executes 200 ms
later and clears the values. I know that this is normal behavior
and that in order to keep the values stored, normally you would use a
shift register. I tried to use this and had some issues with
correct data types/array mis-mtaches, ets, so I created an indicator
and had a local vaible read the indicator, which seems to be working
for the stop bits, read bits, baud rate, etc, but not the parity anf
flow control. I always get "blank" outputs for theses values (if
you enable the digital display you can see that they are outputing the
value 0 which correspondes to None in both cases, which is
correct). Even though it appears that it is outputting the
correct value, I get an error that says the VISA property is
invalid. I initally did a search and found that my stop bit
control was wrong (outputting double instead of integer), but I could
not find anything on the parity/flow control issue. I even tried
to copy the serial config controls from the basic serial read/write to
my dialog box and that did not work either.
I would be grateful for any suggestions.
Thanks
Kenny
Kenny
Attachments:
BGI_main pandc.zip ‏232 KB

I should add that I am using LV 8.0 and that the serial config
indicator in the consumer loop will be off the frontpanel in the final
VI so that it is not visible to the user.
Kenny

SQL query problem using analytical/report function

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insert into t values (1, 15, 30, 'A');
insert into t values (2, 20, 30, 'A');
insert into t values (3, 5, 30, 'A');
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insert into t values (5, 4, 30, 'A');
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     1      15     30 A
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I've tried using sum(), lead(), first(), lag(), etc but I still cannot get the correct result.
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     1      15     30 A
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Edited by: 998373 on Apr 5, 2013 11:42 AM
Edited by: 998373 on Apr 5, 2013 11:43 AM

From 10.x on
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select 2, 20, 30, 'A' from dual union all
select 3, 5, 30, 'A' from dual union all
select 4, 8, 30, 'A' from dual union all
select 5, 4, 30, 'A' from dual union all
select 1, 2, 30, 'B' from dual
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, PRIORITY
, PLANNED_AMOUNT
, AVAILABLE_PIECES PIECES_NOT_RESERVED_YET
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model
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dimension by (PRIORITY)
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rules (
AVAILABLE_PIECES[priority>1] order by priority=
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end
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A     1     15     30
A     2     20     15
A     3     5     15
A     4     8     10
A     5     4     2
B     1     2     30

Problem using in download function

Dear Experts,
I am using download function to download values from application server to desktop.
After downloading the output is like the foollowing.
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0/temp/30/bar(kg)
I have to delete the space and have to give '/' sign.
Please help me to fix this.
Thanks in Advance
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I am using Photoshop CS4 Extended on a Windows XP Pro platform with 3.5 GB of memory. My scanner is an older Visoneer One Touch 8820 and has always worked well when using the File Import in PS. I now receive the message “Could not complete the import command because there is not enough memory (RAM)” when trying to import a scanned image. Under Preferences, Performance the Memory Usage shows 1689 MB of available RAM and Let Photoshop Use: is set to 1452 MB. The file I’m trying to scan is a grayscale business card and my One Touch interface shows the image size as 1.27 MB at 400 dpi. Any help is appreciated.
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You can use PSE with multiple Raw files also but Camera Raw in PSE has very limited options compared to the full ACR and also you can't save as jpeg via PSE.
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How does VISA serial write work?

I am using LabView 6.0 and the VISA functions to run a distributed sensor network using RS-485 from a NT 4.0 machine.
In order to work properly I have to manually control the RTS line which isn't a problem using the property node.
Here's what I want to know.
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, or could this cause me to miss the reply?

Robert:
With the default settings, VISA Write will not return until the data has been at least posted into the hardware FIFO. To be 100% sure that the data has been transmitted over the wire, you should do these 2 things:
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National Instruments

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I am trying to combine labview with my previous fortran functions using Intel Visual Fortran 12.1 and labview 2012 by below steps.
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